I have one of those strategic bombing survey books that covers the German war economy. There is a great anecdote in there. During the war the allies estimated how many machine tools the Germans had, like lathes, mills etc. When the war ended, the allies discovered that the Germans had twice as many tools as they expected. How could this be? The allies assumed that the Germans had the sense to run their machines 24 hours a day, just like they themselves with done. In reality, the machines almost never saw more than 12 hours of use. It was like the Germans were throwing away production capacity. Combine this with a three or four year apprentice program for machinist, and you simply can't make anything in volume.